UWA lenses Full frame vs Crop
Discussion
As we all know the focal length of a lens doesn't change whether it is fitted to a crop sensor camera or a full frame camera (a 50mm is still a 50mm), what changes is the angle of view. So on a crop sensor camera (assume 1.5x) a 50mm lens gives an angle of view equivalent to 75mm lens fitted to a full frame camera.
As we also know, focal length affects the perspective in a photograph, longer focal lengths compressing perspective and shorter exaggerating it.
My question is specifically around ultra-wide lenses where the effect is most obvious.
I have a Nikon DX camera and the 10-24mm lens. At 10mm this gives the same angle of view as a FX camera with a lens at 15mm. My questions is does anyone own both systems and lenses capable of those (or similar) focal lengths. I would love to see a side by side comparison of the same scene from both the DX and FX systems to compare the affect focal length has on two pictures with the same field of view.
Most people talk of lenses on crop cameras and their 35mm equivalence (in terms of field of view) but no-one seems to mention the effect of the change in focal length.
As we also know, focal length affects the perspective in a photograph, longer focal lengths compressing perspective and shorter exaggerating it.
My question is specifically around ultra-wide lenses where the effect is most obvious.
I have a Nikon DX camera and the 10-24mm lens. At 10mm this gives the same angle of view as a FX camera with a lens at 15mm. My questions is does anyone own both systems and lenses capable of those (or similar) focal lengths. I would love to see a side by side comparison of the same scene from both the DX and FX systems to compare the affect focal length has on two pictures with the same field of view.
Most people talk of lenses on crop cameras and their 35mm equivalence (in terms of field of view) but no-one seems to mention the effect of the change in focal length.
Try this:
http://www.cambridgeincolour.com/tutorials/camera-...
Interactive examples are provided and discussed.
For all references throughout the site just type "Perspective" into the Search option and choose whatever looks interesting from the list.
http://www.cambridgeincolour.com/tutorials/camera-...
Interactive examples are provided and discussed.
For all references throughout the site just type "Perspective" into the Search option and choose whatever looks interesting from the list.
Useful link, thanks.
From that and other sources it turns out that perspective is unaffected by focal length but by distance to the subject, which for any given composition is affected by focal length.
So for a given composition, focal length affects how close you are to the subject, which affects perspective.
In my example above the 10mm on a 1.5x Crop sensor camera would give exactly the same image (ignoring DOF) as a 15mm lens on a full frame camera. However using a 50mm on both cameras but changing distance to the subject in order to create a similar image would result in a change in perspective as the ratio of distance from subject to camera and background to camera wouldn't be the same.
From that and other sources it turns out that perspective is unaffected by focal length but by distance to the subject, which for any given composition is affected by focal length.
So for a given composition, focal length affects how close you are to the subject, which affects perspective.
In my example above the 10mm on a 1.5x Crop sensor camera would give exactly the same image (ignoring DOF) as a 15mm lens on a full frame camera. However using a 50mm on both cameras but changing distance to the subject in order to create a similar image would result in a change in perspective as the ratio of distance from subject to camera and background to camera wouldn't be the same.
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